A rotary drilling pile drilling cleaning device and a cleaning method thereof

Abstract

The application discloses a rotary digging cast-in-place pile drilling cleaning device and a cleaning method thereof, and belongs to the cast-in-place pile construction field. The rotary digging cast-in-place pile drilling cleaning device comprises a vertical guide pipe arranged in a cast-in-place pile. The guide pipe comprises a detachably connected upper half pipe and a lower half pipe. The guide pipe is used for extracting mud and stones in the cast-in-place pile. The lower half pipe of the guide pipe is provided with a crushing assembly and a flattening assembly, and the crushing assembly and the flattening assembly are arranged in cooperation. The crushing assembly comprises a rotating sleeve movably sleeved on the guide pipe. An upper opening of the rotating sleeve is rotatably connected with a movable plate body through a bearing. A first servo motor is fixed to an upper surface of the movable plate body. The first servo motor is connected with a driving gear through a transmission shaft. The driving gear is horizontally engaged with a transmission gear. The driving gear and the transmission gear are arranged on a lower surface of the movable plate body. The application solves the problems that the cleaning device is easy to be blocked when there are large stones in the drilling hole, the bottom of the drilling hole is uneven due to mud water, the geology is loose, and the bearing capacity of the hole bottom is affected.

Description

Technical Field

[0001] This invention belongs to the field of cast-in-place pile construction, specifically a rotary cast-in-place pile drilling and cleaning device and its cleaning method. Background Technology

[0002] In bored pile construction, drilling rigs generally employ impact drilling, grab drilling, forward and reverse circulation rotary drilling, and rotary drilling, using mud wall protection technology. Because mud wall protection is used, after drilling to the design depth and confirming that it meets the design requirements, the thick mud and drill cuttings at the bottom of the borehole must be completely removed to ensure the drilling quality. Therefore, a hole cleaning operation is required to reduce the various indicators of the mud, such as specific gravity, viscosity, and sand content, to within the specifications. The purpose is to reduce the sediment layer as thin as possible and improve the bearing capacity at the bottom of the hole.

[0003] However, cleaning the sediment at the bottom of the pile after drilling is difficult. Currently, the common methods for cleaning the pile include positive circulation rotary drilling rigs, reverse circulation rotary drilling rigs, vacuum mud suction machines, and slag suction cylinders. These methods do not clean the sediment thoroughly, have low construction efficiency, and if a large mud ball falls to the bottom of the hole, it is difficult to remove, and the cleaning time is long.

[0004] The existing equipment injects high-pressure air while extracting mud from the borehole to agitate the mud, avoiding uneven mud sedimentation and separation. It can also break down fallen mud clumps into smaller particles, improving the effectiveness and efficiency of a single cleaning operation.

[0005] Research has revealed that existing rotary drilling and cleaning devices for cast-in-place piles have certain drawbacks in use.

[0006] The aforementioned rotary drilling and grouting pile borehole cleaning device can only remove the upper layer of mud and small stones. When there are large stones inside the borehole, it is very easy to cause blockage. Moreover, the mud and water make the bottom of the borehole very uneven during use, and the bottom geology becomes loose, affecting the bearing capacity of the bottom of the hole and making it unable to meet the usage requirements. Therefore, we provide a rotary drilling and grouting pile borehole cleaning device and its cleaning method. Summary of the Invention

[0007] The purpose of this invention is to provide a rotary drilling pile borehole cleaning device and its cleaning method, which solves the problems that the cleaning device is easily clogged when there are large stones inside the borehole; and that mud and water make the bottom of the borehole uneven, the soil loose, and affect the bearing capacity of the bottom of the hole.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A rotary drilling and cleaning device for cast-in-place piles includes a vertical guide pipe installed inside the cast-in-place pile. The guide pipe includes a detachably connected upper half pipe and a lower half pipe. The guide pipe extracts mud and rocks inside the cast-in-place pile. The lower half pipe of the guide pipe is equipped with a crushing component and a flattening component, which are configured in cooperation.

[0010] The crushing assembly includes a rotating sleeve movably fitted onto a guide tube, with a movable plate rotatably connected to the upper opening of the rotating sleeve via a bearing; a first servo motor is fixed to the upper surface of the movable plate, and a drive gear is connected to the first servo motor via a transmission shaft, with the drive gear and transmission gear horizontally meshing; the drive gear and transmission gear are located on the lower surface of the movable plate, and the transmission gear is fixedly fitted onto the rotating sleeve; and horizontally arranged crushing blades are connected to the lower part of the rotating sleeve.

[0011] The upper surface of the movable plate is fixed with a lifting ring, which is connected to a chain on an unwinding device placed around the borehole of the cast-in-place pile.

[0012] The flattening assembly includes a pressure plate, which is located directly below the movable plate. The pressure plate has a radially open slot, and hydraulic rods are fixed at uniform intervals along the circumferential edge of the movable plate. The inner telescopic rods of the hydraulic rods pass through the movable plate and are fixed to the pressure plate.

[0013] The final rotational position of the shredder blade is driven and positioned by the first servo motor, and the final rotational position of the shredder blade corresponds vertically to the opening position of the strip-shaped opening.

[0014] A further preferred technical solution: A lifting ring is fixed on the upper surface of the movable plate, and the lifting ring is connected to a chain on an unwinding device placed around the borehole of the cast-in-place pile.

[0015] The lifting ring includes a fixed post fixed to the upper surface of the movable plate and a collar sleeved on the fixed post.

[0016] A further preferred technical solution: The upper half of the catheter is equipped with a catheter fixing device.

[0017] The guide pipe fixing device includes a limiting plate that is movably sleeved on the upper part of the guide pipe. The vertical surface of the limiting plate is connected with horizontally extending limiting strips at uniform intervals along the circumference. The outer end of the limiting strip is connected to a vertically installed lifting column. The inner lower extension rod of the lifting column passes through the limiting strip and is fixed in the soil around the bored pile.

[0018] A further preferred technical solution: the upper half of the catheter is equipped with a height fine-tuning device.

[0019] The height fine-tuning device includes a U-shaped mounting base fixed to the upper surface of the movable plate. A second servo motor is connected to the outside of the mounting base, and a vertical drive wheel is provided inside the mounting base. The drive shaft of the second servo motor passes through the mounting base and is fixed to the drive wheel.

[0020] A transmission bar is connected to the upper part of the conduit along the height direction. The outer surface of the transmission bar has a groove, and a bar gear is installed in the groove. The bar gear meshes with the drive wheel.

[0021] A further preferred technical solution: The upper end of the guide pipe is connected to a suction pipe via a 90° elbow. The suction pipe is located outside the pile opening and is connected to the suction machine.

[0022] The cleaning method of the rotary drilling pile borehole cleaning device includes the following steps:

[0023] Step 1, Operation of the guide pipe fixing device: Place the limiting plate on the upper opening of the bored pile hole, turn on the lifting column so that the inner lower extension rod of the lifting column is driven downward into the soil around the bored pile hole, and fix the cleaning device on the upper opening of the bored pile hole.

[0024] Step two, the crushing component works to break up the larger stones and clumps of mud at the bottom of the bored pile: the unwinding device is started, the unwinding device unwinds, the movable plate descends, and when the movable plate approaches the bottom of the guide tube, the first servo motor is started. The first servo motor drives the drive gear to rotate, the drive gear drives the transmission gear to rotate, thereby driving the rotating sleeve to rotate, and then driving the crushing blade to rotate, breaking up the stones and larger clumps of mud at the bottom of the bored pile.

[0025] Step 3: While Step 1 is being carried out, the suction machine is started to extract the crushed rocks and mud from inside the bored pile.

[0026] Step four: The crushing component stops working. At this time, the first servo motor precisely controls the crushing blade to be positioned directly below the strip opening on the pressure plate, and the crushing blade can pass through the strip opening from top to bottom.

[0027] Step 5, the height fine-tuning device works: the second servo motor starts, driving the guide tube to descend, realizing the comprehensive suction of rocks and mud in the bored pile hole.

[0028] Step 6, Flattening component operation: After the full suction is completed, the hydraulic rod is activated, and the pressure plate passes through the strip-shaped opening and the crushing blade to descend, thereby flattening the bottom of the bored pile.

[0029] Step seven: Finally, the second servo motor starts, driving the guide tube to rise, removing the suction tube, moving the limiting plate away, and removing the upper half of the guide tube.

[0030] Step eight: Then start the unwinding device to wind up, then remove the movable plate and store all components for later use.

[0031] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0032] Firstly, this invention describes a rotary drilling and cleaning device for cast-in-place piles. During use, the height of the crushing component is changed by the unwinding device, so that the crushing component is close to the bottom of the borehole. The crushing component is activated, which can break up the rocks and large mud clumps at the bottom of the borehole, thereby facilitating suction and discharge and effectively preventing blockage. After suction, the bottom of the borehole is flattened by the flattening component, making the geological conditions at the bottom of the borehole more stable, thereby improving the bearing capacity of the bottom of the hole. It has good performance and good application prospects.

[0033] Secondly, this invention describes a rotary drilling pile borehole cleaning device, which includes a flattening component. When in use, the hydraulic rod in the flattening component is activated, driving the pressure plate to descend and contact the bottom surface of the borehole, thus directly flattening the bottom of the borehole. Moreover, the operation of the pressure plate does not interfere with the crushing component, resulting in good performance and promising application prospects.

[0034] Thirdly, this invention describes a rotary drilling and cleaning device for cast-in-place piles, which includes a height fine-tuning device. When in use, the second servo motor can drive the drive wheel to rotate, thereby driving the guide tube to move up and down, so that the guide tube can be inserted into the borehole and gradually descend as the amount of rocks and mud decreases, achieving complete extraction. It has good performance and good application prospects. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 This is a structural diagram of the limiting bracket in this invention;

[0037] Figure 3 This is a partial structural diagram of the catheter in this invention;

[0038] Figure 4 This is a partial structural diagram of the movable frame in this invention;

[0039] Figure 5 This is a partial structural diagram of the movable frame in this invention.

[0040] Reference numerals in the attached drawings: 1. Conduit; 2. Limiting bracket; 3. Movable frame; 4. Rotating sleeve; 5. Crushing blade; 6. First servo motor; 7. Drive gear; 8. Transmission gear; 9. Hydraulic rod; 10. Pressure plate; 11. Strip-shaped opening; 12. Limiting strip; 13. Lifting column; 14. Mounting base; 15. Second servo motor; 16. Drive wheel; 17. Transmission strip; 18. Suction pipe; 19. Lifting ring. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] See Figures 1 to 5 As shown, the present invention discloses a rotary drilling pile borehole cleaning device and cleaning method. The rotary drilling pile borehole cleaning device includes a vertical guide tube 1 installed inside the pile. The guide tube 1 includes an upper half pipe and a lower half pipe that are detachably connected. The guide tube 1 extracts mud and stones inside the pile. The device is characterized in that: the lower half pipe of the guide tube 1 is provided with a crushing component and a flattening component, which are configured in cooperation.

[0043] The crushing assembly includes a rotating sleeve 4 movably fitted onto a guide tube 1. The upper opening of the rotating sleeve 4 is rotatably connected to a movable plate 3 via a bearing. A first servo motor 6 is fixed on the upper surface of the movable plate 3. The first servo motor 6 is connected to a drive gear 7 via a transmission shaft. The drive gear 7 and the transmission gear 8 are horizontally meshed. The drive gear 7 and the transmission gear 8 are located on the lower surface of the movable plate 3. The transmission gear 8 is fixedly fitted onto the rotating sleeve 4. A horizontally arranged crushing blade 5 is connected to the lower part of the rotating sleeve 4. The crushing blades 5 are symmetrically connected to a pair of sides of the rotating sleeve 4, with two crushing blades 5 aligned on each side.

[0044] A lifting ring 19 is fixed on the upper surface of the movable plate 3. The lifting ring 19 is connected to a chain on an unwinding device placed around the borehole of the cast-in-place pile. The lifting ring 19 includes a fixed post fixed to the upper surface of the movable plate 3 and a collar sleeved on the fixed post.

[0045] The movable plate 3 is held in place by the chain on the unwinding device. Based on the position of the large rock in the borehole of the cast-in-place pile, the movable plate 3 is lowered to the position of the large rock. Then, the first servo motor 6 is started. The first servo motor 6 drives the drive gear 7, the transmission gear 8 and the rotating sleeve 4 to rotate in sequence. This drives the crushing blade 5 at the bottom of the rotating sleeve 4 to cut the large rock in the borehole of the cast-in-place pile and crush it. Since the upper opening of the rotating sleeve 4 is rotatably connected to the movable plate 3 through a bearing, the movable plate 3 will not have a large positional movement when the rotating sleeve 4 rotates and drives the crushing blade 5 to cut the large rock.

[0046] The flattening assembly includes a pressure plate 10, which is located directly below the movable plate 3. The pressure plate 10 has a radially open strip 11. Hydraulic rods 9 are fixed at uniform intervals along the circumferential direction on the edge of the movable plate 3. The inner telescopic rods of the hydraulic rods 9 pass through the movable plate 3 and are fixed on the pressure plate 10.

[0047] The final rotational stopping position of the crushing blade 5 is driven and positioned by the first servo motor 6, and the final rotational stopping position of the crushing blade 5 corresponds vertically to the opening position of the strip-shaped opening 11; the servo motor can precisely control the rotation angle and speed by receiving control signals.

[0048] When in use, the hydraulic rod 9 in the flattening component is activated, which drives the pressure plate 10 to descend, so that the pressure plate 10 descends and contacts the bottom surface of the drill hole, which can directly flatten the bottom of the drill hole. Moreover, the operation of the pressure plate 10 does not interfere with the crushing component, resulting in good performance and promising application prospects.

[0049] During use, the height of the crushing and flattening components is changed by the unwinding device, so that the movable plate 3 is close to the bottom of the borehole. The crushing component is then activated, which breaks up the stones and larger clumps of mud at the bottom of the borehole, making it easier to pump them out and effectively preventing blockages. After pumping, the flattening component flattens the bottom of the borehole, making the geological conditions at the bottom of the borehole more stable, thereby improving the bearing capacity of the bottom of the hole. It has good performance and promising application prospects.

[0050] The upper half of the guide pipe 1 is equipped with a guide pipe fixing device; the guide pipe fixing device includes a limiting plate 2 that is movably sleeved on the upper part of the guide pipe 1. The vertical surface of the limiting plate 2 is evenly connected with horizontally extending limiting strips 12 along the circumferential direction. The outer end of the limiting strips 12 is connected to a vertically installed lifting column 13. The inner lower extension rod of the lifting column 13 passes through the limiting strips 12 and is fixed in the soil around the bored pile.

[0051] The upper half of the conduit 1 is equipped with a height fine-tuning device; the height fine-tuning device includes a U-shaped mounting base 14 fixed on the upper surface of the movable plate 3, a second servo motor 15 is connected to the outside of the mounting base 14, and a vertical drive wheel 16 is provided inside the mounting base 14. The drive shaft of the second servo motor 15 passes through the mounting base 14 and is fixed to the drive wheel 16.

[0052] A transmission bar 17 is connected to the upper part of the conduit 1 along the height direction. The outer surface of the transmission bar 17 is provided with a groove, and a bar gear is provided in the groove. The bar gear meshes with the drive wheel 16.

[0053] The height fine-tuning device, when in use, the second servo motor 15 can drive the drive wheel 16 to rotate, thereby driving the guide tube 1 to move up and down, so that the guide tube 1 can be inserted into the borehole and gradually descend as the amount of rocks and mud decreases, and can be completely extracted. It has good performance and good application prospects.

[0054] The upper end of the conduit 1 is connected to a suction pipe 18 via a 90° elbow. The suction pipe 18 is located outside the pile opening and is connected to the suction machine.

[0055] The cleaning method for rotary drilling pile borehole cleaning devices includes the following steps:

[0056] Step 1, Operation of the guide pipe fixing device: Place the limiting plate 2 at the upper opening of the grouting pile borehole, turn on the lifting column 13 so that the inner lower extension rod of the lifting column 13 is driven downward into the soil around the grouting pile borehole, and fix the cleaning device at the upper opening of the grouting pile borehole.

[0057] Step two, the crushing component works to break up the larger stones and clumps of mud at the bottom of the bored pile: the unwinding device is started, the unwinding device unwinds, the movable plate 3 descends, and when the movable plate 3 approaches the bottom of the guide tube 1, the first servo motor 6 is started. The first servo motor 6 drives the drive gear 7 to rotate, the drive gear 7 drives the transmission gear 8 to rotate, thereby driving the rotating sleeve 4 to rotate, and then driving the crushing blade 5 to rotate, breaking up the stones and larger clumps of mud at the bottom of the bored pile.

[0058] Step 3: While Step 1 is being carried out, the suction machine is started to extract the crushed rocks and mud from inside the bored pile.

[0059] Step four: The crushing component stops working. At this time, the first servo motor 6 precisely controls the crushing blade 5 to be positioned directly below the strip opening 11 on the pressure plate 10, and the crushing blade 5 can pass through the strip opening 11 from top to bottom.

[0060] Step 5, the height fine-tuning device works: the second servo motor 15 starts, driving the guide tube 1 to descend, realizing the comprehensive suction of rocks and mud in the bored pile hole.

[0061] Step 6, flattening component operation: After the full suction is completed, the hydraulic rod 9 is activated, and the pressure plate 10 passes through the strip-shaped opening 11 and the crushing blade 5 to descend, thereby flattening the bottom of the grouting pile borehole.

[0062] Step 7: Finally, the second servo motor 15 is started, which drives the guide tube 1 to rise, remove the suction tube 18, remove the limiting plate 2, and remove the upper half of the guide tube 1.

[0063] Step 8: Then start the unwinding device to wind up, then remove the movable plate 3 and store all components for later use.

[0064] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0065] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rotary drilling and cleaning device for cast-in-place piles, comprising a vertical guide pipe (1) disposed within the cast-in-place pile, the guide pipe (1) comprising a detachably connected upper half-section pipe and a lower half-section pipe, the guide pipe (1) for extracting mud and rocks from the cast-in-place pile, characterized in that: The upper half of the guide pipe (1) is provided with a guide pipe fixing device; the guide pipe fixing device includes a limiting plate (2) that is movably sleeved on the upper part of the guide pipe (1), and the vertical surface of the limiting plate (2) is evenly connected with horizontally extending limiting strips (12) along the circumferential direction. The outer end of the limiting strip (12) is connected to a vertically set lifting column (13), and the inner lower extension rod of the lifting column (13) passes through the limiting strip (12) and is fixed in the soil around the bored pile. The upper half of the conduit (1) is equipped with a height fine-tuning device; the height fine-tuning device includes a U-shaped mounting base (14) fixed on the upper surface of the movable plate (3), a second servo motor (15) is connected to the outside of the mounting base (14), and a vertical drive wheel (16) is provided inside the mounting base (14). The drive shaft of the second servo motor (15) passes through the mounting base (14) and is fixed to the drive wheel (16); The upper part of the conduit (1) is connected to a transmission bar (17) along the height direction. The outer surface of the transmission bar (17) is provided with a groove, and a bar gear is provided in the groove. The bar gear meshes with the drive wheel (16). The upper opening of the guide tube (1) is connected to a suction tube (18) via a 90° elbow. The suction tube (18) is located outside the pile opening of the grouting pile and is connected to the suction machine. The lower half of the conduit (1) is equipped with a crushing component and a flattening component, which are configured in conjunction with each other. The crushing assembly includes a rotating sleeve (4) movably fitted onto a guide tube (1). The upper opening of the rotating sleeve (4) is rotatably connected to a movable plate (3) via a bearing. A first servo motor (6) is fixed on the upper surface of the movable plate (3). The first servo motor (6) is connected to a drive gear (7) via a transmission shaft. The drive gear (7) and the transmission gear (8) are horizontally meshed. The drive gear (7) and the transmission gear (8) are located on the lower surface of the movable plate (3). The transmission gear (8) is fixedly fitted onto the rotating sleeve (4). A horizontally arranged crushing blade (5) is connected to the lower part of the rotating sleeve (4). A lifting ring (19) is fixed on the upper surface of the movable plate (3), and the lifting ring (19) is connected to a chain on the unwinding device placed around the borehole of the cast-in-place pile; The flattening assembly includes a pressure plate (10), which is located directly below the movable plate (3). The pressure plate (10) has a radially open slot (11). Hydraulic rods (9) are fixed at uniform intervals along the edge of the movable plate (3). The inner telescopic rod of the hydraulic rod (9) passes through the movable plate (3) and is fixed on the pressure plate (10). The final rotation and stopping position of the crushing blade (5) is driven and positioned by the first servo motor (6), and the final rotation and stopping position of the crushing blade (5) corresponds vertically to the opening position of the strip opening (11).

2. The cleaning method of the rotary drilling pile borehole cleaning device according to claim 1, characterized in that, The steps are as follows: Step 1, the guide pipe fixing device works: place the limiting plate (2) on the upper opening of the grouting pile borehole, turn on the lifting column (13) so that the inner lower extension rod of the lifting column (13) is inserted downward into the soil around the grouting pile borehole, and fix the cleaning device on the upper opening of the grouting pile borehole. Step 2, the crushing component works to break up the larger stones and mud clumps at the bottom of the bored pile: start the unwinding device, the unwinding device unwinds, the movable plate (3) descends, when the movable plate (3) approaches the bottom of the guide tube (1) the first servo motor (6) is started, the first servo motor (6) drives the drive gear (7) to rotate, the drive gear (7) drives the transmission gear (8) to rotate, thereby driving the rotating sleeve (4) to rotate, and then driving the crushing blade (5) to rotate, breaking up the stones and mud clumps at the bottom of the bored pile; Step 3: While Step 1 is being carried out, the suction machine is started to extract the crushed rocks and mud from inside the bored pile hole. Step 4: The crushing assembly stops working. At this time, the crushing blade (5) is precisely controlled by the first servo motor (6) to be located directly below the strip opening (11) on the pressure plate (10). The crushing blade (5) can pass through the strip opening (11) from top to bottom. Step 5, height fine adjustment device works: the second servo motor (15) starts, driving the guide pipe (1) to descend, realizing the comprehensive suction of rocks and mud in the grouting pile borehole; Step 6, flattening component operation: After the full suction is completed, the hydraulic rod (9) is started, and the pressure plate (10) passes through the strip-shaped opening (11) and the crushing blade (5) to descend, thereby flattening the bottom of the grouting pile borehole; Step 7: Finally, the second servo motor (15) is started, which drives the conduit (1) to rise, remove the suction tube (18), remove the limiting plate (2), and remove the upper half of the conduit (1). Step 8: Then start the unwinding device to wind up, then remove the movable plate (3), and store all components for later use.

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